Injector



No. 6l4,752. Patented Nov. 22, I898. W. R. PARK 8:. B. T. WILLISTON.INJECTOR.

(Application filed Aug. 2, 1898.) (ModeL) 2 Sheets-Sheet l.

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No. 6l4,752. Patented Nov. 22, I898.

W. R. PARK 81. B. T. WILLISTON.

' INJECTOR.

(Application filed Aug. 2, 189B.) M odal.).

Z Sheets--Sheet 2 WITNESSES NITED STATES PATENT Futon.-

I/VILLIAM R. PARK, OF TAUNTON, AND BELVIN T. WVILLISTON, OF SOMER-VILLE, MASSACHUSETTS, ASSIGNORS TO THE HANCOCK INSPIRATOR COM- PANY, OFBOSTON, MASSACHUSETTS.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 614,752, dated November22, 1898.

Application filed August 2, 1898. Serial No. 687,495. (Model) To allwhom it may concern:

Be it knownthat we, WILLIAM R. PARK, a resident of Taunton, county ofBristol, and BELVIN T. WILLISTON, a resident of Somerville, county ofMiddlesex, State of Massachusetts, citizens of the United States ofAmerica, have invented certain new and useful Improvements in Injectors,of which the following is a specification.

This invention relates to boiler feed-injectors wherein the finaloverflow or waste valve is operated by connections with the mechanism bywhich the steam-admission valve of the injector is controlled, and hasfor its object the provision of a simple and effective contrivancewhereby the overflow-Valve connections maybe independently manipulated.

Injectors are often used to heat the feedwater by blowing steam backthrough the suction-passages. Ordinarily in injectors of the classdescribed this blowing-back action is secured by an abrupt full openingof the main steam-valve, the movement of the valveoperating handle beingpurposely made so sudden as to close the final overflow-valve throughits connections with the steam-valveoperating mechanism beforesuificient op-' portunity has been afforded for the formation of a jetwithin the tubes of the injector. The steam then follows the path opento it through the chambers of the injector-casing to the suction-pipeand feed-water tank, heating the waterin the tank. This necessitates,first, a full opening of the steam-valve, which in itself may not benecessary or desirable, and, further, involves a sudden, forcible, andjarring movement, which tends to strain or inj ure the overflow-valveand its connections. By the invention here described means are providedwhereby the final overflow-valve may be independently closed, leavingthe steam-valve free to be opened, either slightly or wholly, as theoperator may desire. We

also provide means whereby after disengagement from thesteam-valve-operating mechanism the overflow-valve connections areautomatically restored to their normal condition of engagement with thesteam-valveoperating mechanism.

The inventions and improvements herein described are shown in thedrawings annexed to this specification as applied to an injector orinspirator such as is shown and described in United States LettersPatent No. 492,944., issued to W. R. Park and B. T. lVilliston March 7,1893, to which patent we refer for a full description of the inspiratorand its operative parts. The herein-described improvements areapplicable, however, to injectors of types other than that shown anddescribed in the said patent.

In the drawings hereto annexed, wherein like letters are uniformly usedto designate like parts, Figure l is a longitudinal elevation and partsection of an injector provided with the herein-described improvements,the overflow-valve connections being shown in their normal condition ofengagement with the steam-valve-operating mechanism. Fig. 2 is a similarview of the injector shown in Fig. 1, showing the overflow-valveconnections disengaged from the steam-valVe-operating mechanism; andFig. 3 is a detail showing more particularly a form of connectingrod bywhich the overflow-valve is operated.

A is the injector-casing, shown in part section, so as to disclose thefinal overflow-Valve O and its seat 0. The steam admission valve (notshown in the drawings) is operated by a handle H, which is mounted onthe in jector-casing by a pivot-and-link connection h h 71. The stem ofthe steam-admission valve is shown at V and is pivoted to thehandle-lever H at o. The overflow-valve connections consist of the valve-stem 0 which passes through the stufiing-box 0. The valve-stem O isconnected to a bell-crank lever L L by means of a short link L, thebell-crank lever being pivotally secured at Z to a standard S, mountedon the injectorcasing. The arm L of the bell-crank lever has pivotallyconnected therewith a rod R, which is connected also with thehandle-lever H of the steam-valve-operating mechanism. This lever 11 hassecured to it a stud B, which serves as one member of the connectionbetween the rod R and the steam-valve-operating mechanism. The rod R isremovably secured in its relationship with the steam-valveoperatingmechanism in the manner follow- I00 ing: A notch N, open at one side ofthe rod R, is formed in the rod and is so shaped as to provide a secureseat for the stud B. The rod R, which is pivoted to the bell-crank leverL L at R has for convenience a projection or handle R, whereby the rod Bmay be lifted out of engagement with the stud The rod is then free to bemoved independently of the steam-valve mechanism, and by this movementthe overflow-valve 0 may be closed.

In Fig. 2 the rod R is shown disengaged from the stud B and withdrawn tothe position of overflow-valve closure,the steam-valve remaining closed.Vith the parts in this position the injector is ready to be operated asa heater.

In order to restore the several described parts to their normalcondition of operative engagement, a guiding-surface G is formed nearthe end of the rod, the said guiding-surface G being so arranged inproximity to the notch N that the stud B by a full outward movement ofthe steam-valve-operating mechanism automatically slides into its normalengagement with the notch N. hen, therefore, the steam is shut off by areturn movement of the handle II, the restored connection between thesteam-valve-operating mechanism and the overflow-valve mechanism causesthe overflow-valve to open and places the injector in its normalcondition of readiness to operate as a boiler-feeder.

In order to insure the automatic restoration of the several parts totheir normal condition of connection and at the same time to leave themfree to be disconnected at the will of the operator, a spring-guard isprovided whereby the stud B and notch N are forcibly urged into mutualengagement whenever by the movement of the operative parts they arebrought into proper relationship. A convenient and practical mode ofattaching and adjusting this spring-guard is shown in the drawings,reference being made especially to Fig. 3. A stout leaf-spring E issecured to the rod R at E and lies opposite the notch N andguidingsurface G. This spring E is adjusted so as to exert its biasagainst the stud 13, holdin g the latter into engagement with the notchN with sufficient firmness to prevent the two parts from accidentaldisengagement by accident or jar. At a point opposite the free end ofthe spring E a shoulder E is formed on the rod B. This shoulder Econstitutes a hearing for the free end of the spring E and prevents thelatter from being unduly distorted when the rod R is lifted out ofengagement with the stud B. lVhen the rod R is in the position shown inFig. 2 and the steam-valve handle II is moved outward, the stud B,sliding over the surface G, slips over the spring E until the notch N isreached, when the spring instantly snaps the two partsnamely, the rodand stud-into engagement.

The spring E may be dispensed with, and

the rod R, arranged as shown, will by its own weight restore itself tonormal relationship with the steam-valve-operating devices; but when theinjector is used in situations where it is liable to be jarred, as on alocomotiveengine, the spring arrangement will be found desirable.

What we claim, and desire to secure by Letters Patent, is-

1. In an injector, the combination of the following parts: asteam-admission valve, mechanism for operating the said steam-valve, afinal overflow-valve, mechanism for operating the said overflow-valvecomprising a rod which connects the steam-valve-operating mechanism withthe final overflow-valve, the said rod provided with a notch adapted toengage with the steam-valve-operatin g mechanism whereby theoverflow-valve connectingrod may be removed from engagement with thesteam-valve'operating mechanism and the overflow-valve independentlyoperated, substantially as described.

2. In an injector, the combination of the following parts: asteam-admission valve, meclb anism for operating the said steam-valve, afinal overflow-valve, mechanism for operating the final overflow-valvecomprising a rod which connects the steam-valve-operating mechanism withthe final overflow, a stud attached to the steam-valve-operatingmechanism, a notch in the overflow-valve connectingrod adapt-ed toengage with the said stud, a guiding-surface on the rod adjacent to thenotch-opening whereby the notch and stud are automatically slipped intoengagement, substantially as and for the purposes described.

3. In an injector, the combination of the following parts: asteam-admission valve, mechanism for operating the said steam-valve, afinal overflow-valve, mechanism for operatin g the final overflow-valvecomprising a rod, which connects the steam-valve-operating mechanismwith the final overflow-valve, a stud attached to thesteam-valve-operating mechanism, a notch in the overflow-valveconnecting-rod adapted to engage with the said stud, a guiding-surfaceon the rod adjacent to the notch-opening, whereby the notch and stud areautomatically slipped into engagement, a spring secured to the said rod,the said spring being adjusted and adapted to urge the stud intoengagement with the notch, substantially as and for the purposes setforth.

4. In an injector, the combination of the following parts: asteam-admission valve, mechanism for operating the said steam-valve, afinal overflow-valve, mechanism for operating the final overflow-valvecomprising a rod, which connects the steam-valve-operating mechanismwith the final overflow-valve, a stud attached to thesteam-valve-operating mechanism, a notch in the overflow-valveconnecting-rod adapted to engage with the said IEO stud, aguiding-surface 0n the rod adjacent ited, substantially as and for thepurposes set I0 to the notch-opening, whereby the notch and forth.

stud are automatically slipped into engage- Signed by us at Boston this27th dayof July, Inent, a spring secured to the said rod, the A. D.1898.

5 said spring being adjusted and adapted to WILLIAM R. PARK.

urge the stud into engagement with the BELVIN T. WVILLISTON; notch, anda guard on the said connecting- Vitnesses: rod in the path of movementof the said spring ODIN B. ROBERTS,

whereby the movement of the spring is lim- E. F. GROLL.

